Slushing compositions



Patented Oct. 10, 1944 2,359,948 SLUSHING COMPOSITIONS Louis H. Sudhols,

Douglaston, N.- 2., Oil Company, corporation of No Drawing.

This invention is directed toward the preparation of a slushing compound which is capable of depositing a continuous protective waxy film on metal surfaces in one cold application.

is required as a proon metal surfaces, it

one of the fol.-

Whenever a wax coating tective anti-corrosion film has been customary to resort to lowing methods. g

(1) To apply successive coats of wax solution in organicsolvents such as naphtha, one application being insumcient because of the very low solubility of waxes in petroleum and other known reasonably priced solvents. For instance, the solubility of micro-crystalline wax 160F. MP at 70 F. in ordinary Stoddard solvent is in the order of 2%. The solubility'of a lower melting point wax is somewhat higher but still within the order of 4-5%.

(2) Hot dipping or metal parts in molten wax.

This process has all known disadvantages of handling hot materials, the necessity of more expensive dipping equipment with heating coils, deterioration of wax throughoxidation and poor control of the thickness oi the film.

This invention has for its object the provision of a slushing compound capable of being utilized in the form of a cold spray, cold dip, or painted on, or similar cold application method which can carry and deposit enough waxy material in a single application to give eflicient covering and protection against corrosion and rust damage by atmospheric agencies.

It has been discovered that more wax can be held in naphtha, uniformly distributed, 11 small amounts of gel-forming materials are added to the naphtha. Aluminum soaps of fatty acids, such as aluminum stearate, aluminum naphthenate, aluminum resinates of various origin and the like, are suitable for the purpose.

Example I As an example of matter we give below the composition of one such compound:

demonstrated by simulated service tests known the above composition oi.

aslignors to Incorporated, New

New York Application June n, 1941, rial No. 391,550

6 Claims- (Cl. ins-26a) of condensation and Julia 0. Dean, socony-Vacuum York, N. Y a

spray test described in the pro- A. S; T. 11., vol. 33, 1933, part 1, and so called condensation bath tests in the industry but not accepted yet by recognized technical societies. In the Navy salt spray bath, specimens of metals or metal parts are suspended in a corrosion proof nonmetallic bath and subjected to salt water spray. The concentration of salt in the water is 4% NaCl. The spraying is done in 20 minute periods twice a day for five consecutive days. At the end of this period the specimens must not show any signs of corrosion upon the removal oi slushing compounds with solvents.

In the condensation bath the specimens are kept in a bath with rigidly controlled temperature and humidity for twenty days. The period of moisture isfollowed by a drying period, a complete cycle consisting of 24 hours of alternate condensation and drying. In other words, a complete test covers 20 cycles. At the end or the 20 day period, the specimens should not show signs of corrosion or discolora- The naphtha slushing compound described herein has passed the Navy test (20 days) and the condensation bath (20 days) without any signs oi corrosion or discoloration of the metal surfaces. Low carbon steel was used in these experiments.

In formulatin dard solvent, or an of solvents usually used in such applications such as benzene, carbon tetrachloride, and others.

The usual preference will be for a moderately volatilev lisht petroleum solvent, such as the wellknown Stoddard solvent or the usual V. M. 8: P. (varnish makers and painters) naphtha.

The wax to be used may be paramn wax, crude or refined, or microcrystalline waxes of petro-' leum, origin, crude or refined, or any mixture of these, or it may be the natural waxes of vege-. table and animal origin, or any mixture of these with or without added wax of petroleum origin. The characterizing feature of these wax emulsions is the presence therein of substantially more wax than issoluble in the solvent oil, the wax being held therein by a suspension agent. Thus, with pe roleum solvents of the usual type, capable of dissolving only up to about 5 percent of the most soluble wax in the most effective solvent, the amount oi wax will range from upwards of about 5% to about 50% or in-amount sumcient to maintain the wax in susmore, a usual and preferred composition conpension.

taining about 25% of waxy material. I 3. A slushing composition consisting of less "The suspension agent may be an aluminum than one weight percent of an aluminum soap.

present, and are sufficient merely to hold the wax 4. A slushing composition consisting of not {in suspension, and not to give a thickened or gel more than about one half of one percent by form of compound of highviscosity. It may also weight of an aluminum soap, about twenty-five be any other soap of a metal which soap exhibpercent by weight of petroleum wax, and nonits a gelling tendency when peptized in a hydroviscous light petroleum solvent oil, the said soap carbon. For example, soaps of the above acids 15 being present only in amount suflicient to mainwith sodium, potassium, barium, manganese, cotain the wax in suspension.

bait. and magnesium may be used. Such soaps 5. A slushing compound consisting of a nonmay be termed gel-forming soaps for purposes 4 viscous light petroleum solvent oil, a waxy ms.- or definition. Of such soaps, aluminum soaps terial of petroleum origin, and comprising parafare preferred. 20 tin and microcrystalline waxes. present in an We claim: amount of at least about 5 percent and substan- 1. A slushing compound consisting substantially greater than can be dissolved in said soltially of a nonviscous light petroleum solvent oil, vent oil and less than one percent by weight of an amount of at least about 5% and substan- 26 only" in amount sumcient to maintain the wax vent oil and less than one percent by weight of 6. A slushing composition consisting of not an aluminum soap, the said soap being present more than about one half of one percent by only in amount sufficient to maintain the wax in weight or an aluminum soap, about twenty-five suspension. 80 percent by weight of petroleum waxes, compris- A slushing composition consisting of from ingparaiiine and microcrystalline wax, and non-- 2 about five to about 50 weight percent of a mix viscous light petroleum solvent oil, the said soap the remainder being a nonviscous light petro- LOUIS H. SUDHOLZ. leum solvent oil, the said soap being present only JOHN C. DE N. 

